The ongoing trade conflict between the United States and Canada is increasingly affecting several key states with closely contested Senate races ahead of the 2026 midterm elections. States including Iowa, Maine, Michigan, New Hampshire, Ohio, and Texas conducted $188 billion worth of trade with Canada over the 12 months ending in June 2026, representing more than a quarter of the total $674 billion in annual bilateral trade, according to data from Advancing American Freedom (AAF), a conservative organization founded by former Vice President Mike Pence.

The analysis further revealed that several states are significantly dependent on Canada for trade in goods. Specifically, Canada accounted for 62% of Maine’s annual trade in goods, 30% in Minnesota, 29% in both Iowa and Michigan, 23% in Ohio, and 16% in New Hampshire during the same period.

The trade dispute escalated on August 22 when the U.S. imposed 50% tariffs on approximately $28 billion of Canadian imports, targeting products such as beer, cheese, and electronics. In response, earlier this month, Canada imposed retaliatory tariffs ranging from 15% to 50% on more than $20 billion in American goods, including steel, aluminum, wool, lumber, and dairy products.

These tariff measures have raised concerns due to their timing and potential electoral impact, as several of the affected states are battlegrounds in the Senate race. Republicans are defending seats in Iowa, Maine, Ohio, and Texas, while also aiming to win seats in Minnesota and New Hampshire. Meanwhile, Democrats need to flip a net of four seats to regain control of the Senate.

The economic strain caused by the tariffs may influence voter sentiment in these regions, where trade relations with Canada constitute a significant portion of local economies. The situation underscores the broader implications of trade policies on domestic political dynamics as the midterm elections approach.